REL’s MLF 250 is the toughest, most space efficient, and most conformable FPI system on the planet.

The human-driven Model MLF 250 fluorescent penetrant inspection (FPI) system is precision engineered and manufactured to meet mission-critical requirements for the US Navy. The MLF 250 has the highest space efficiency commercially available with a part volume per footprint area ratio PV/FA=1.12.

In a Method D configuration, the MLF 250 can process shafts up to 4’ in length with a machine footprint of 11’ to comply with the standards set forth in MIL-STD-810G for Impact, Vibration, Acceleration, and Extreme Environmental Testing. It is now available to be purchased by any branch of the armed forces as well as private industry. The system can be configured for any, and multiple, FPI methods with 3, 4, 5, or more stations.  

Back to Human-Driven Lines

REL Engineered Solutions Non-Destructive Testing Human Drive Lines MLF250 Inspection


  • Available in 3, 4, & 5 station configurations
  • Space efficient, modular FPI System
  • NSN #6635-01-663-6127 for the 3 Station Model MLF 250
  • Part Envelope Size: 20” x 40” x 20”
  • Meets MIL-STD-810G for Impact, Vibration, Acceleration, & Extreme Environmental Testing
  • Designed for Corrosive Environments
  • Hexavalent Chrome Free
  • Comes with Plating Free Fasteners
  • Complete HMMP (Hazardous Material Management Plan)
Certifications & Compliances
NSN# 6635-01-663-6127
MIL-STD-810G: Tested & in Compliance
UL Listed: 508A Power Distribution Panel
MIL-PRF-20696F: Type II, Class 2
REL Engineered Solutions Non-Destructive Testing Human Drive Lines MLF250

Designed to meet ASTM E1417 and MIL-STD-1839C Compliant

  1. Low-Temperature Storage: 
    MIL-STD-810G, Tested at -40°F
  2. High-Temperature Storage: 
    MIL-STD-810G, Tested at +160°F
  3. Low-Temperature Operation: 
    MIL-STD-810G, Tested at +50°F
  4. High-Temperature Operation: 
    MIL-STD-810G, Tested at +104°F
  5. Air Transportation Sustained Acceleration: 
  6. Shock: MIL-STD-810G 
  7. Vibration: MIL-STD-810G, Tested at General Exposure Jet Aircraft Standards

Additional benefits: Tested safe, hexavalent chrome-free, plating-free fasteners, and complete HMMP (available upon request).



3 Station Module

4 Station Module

5 Station Module